The Insider.com

When I spoke with actress Lana Parrilla earlier this month, she told me, "You get to see more vulnerable sides to the Queen coming up – how she became evil." Well that time has come as you can see in this brand-new, sneak-peek clip from Sunday's episode!

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Titled Fruit of the Poisonous Tree, the hour focuses heavily on Regina as Sidney Glass threatens to expose a scandalous secret that would forever change the way Storybrooke views their mayor. Meanwhile, back in fairytale land, Once Upon A Time introduces a very different version of The Queen ... and reveals how she became the wicked woman we know today!

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Once Upon A Time airs Sundays at 8 p.m. on ABC.